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a in (-oo:+oo)
3/10 = a/14 // - a/14
3/10-(a/14) = 0
3/10-1/14*a = 0 // - 3/10
-1/14*a = -3/10 // : -1/14
a = -3/10/(-1/14)
a = 21/5
a = 21/5
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